Why are girls so awkward? They are excited and affectionate one week and totally withdrawn the other week.?

Why cant they just be consistent and be cool all around. Like one week the girl hugs me and interacts with me and the other week shes quiet and doesn't even look at me or if she does shes angry. It might be PMS but please I lived with my mom and my sister and I know its controllable. Its not like you turn into the HULK. Why did god make girls so moody and inconsistent? If only i could read the minds of girls and what they think. I wish i was mel gibson in that movie where he falls in the tub with his blowdryer =D